to the right hand side across from the game theres a live chat that some people are seeing... not everyone seems to have it. its a facebook feature and you can if you have it turn the live chat off.
i'll take a screen shot and post it

Ah, not the chat I was thinking of!This is likely Facebook testing a new feature by trying it on a small subset of people.They do that a lot.You can probably expect this live chat to be in wider use before long!